Drawings of Fuel /Evap Lines

[Savidio44]

Can anyone point me to drawings of specifically the evap lines from the fuel tank to the charcoal canister under the hood. I am trying to find source of fuel smell in cab. I found no evidence of leakage under, behind or anywhere on the tank. The rubber hoses show no evidence of leakage. However, at the fuel sending unit, the hose closest to the front of the cab, goes through the cab floor immediately makes a 90 and is closed off using a method no GM engineer would approve. My guess is that this should connect by rubber hose to the charcoal canister but I can't find a drawing on how this should be connected. I'm thinking that this connection should pull a slight vacuum on the tank thus reducing vapors in cab. Any help out there would be appreciated.

Thanks,

Dan